Effect of temperature and volume on the tensile and adhesive properties of photocurable resins

Abstract

Knowing the mechanical properties of UV‐curable resins at cryogenic conditions is important to ongoing fusion‐energy research and to emerging aerospace applications. The tensile and interfacial shear strengths of two commercially available UV‐curable resins were measured at room‐temperature and cryogenic conditions for both bulk and reduced (subnanoliter) specimen volumes. The tensile properties of cured specimens are remarkably sensitive to both testing temperature and specimen size. For one type of resin, the cold (−150 °C) tensile strength of subnanoliter specimens is ∼9× larger (179 ± 19 MPa) than bulk values at room temperature. The interfacial shear strength between SiC fibers and small volumes of resin volumes is comparable to the bulk, room‐temperature tensile strength, but it varies over a wide range at −150 °C (15–53 MPa). All resins were fully cured, and an analysis of fractured surfaces revealed microstructural features. The enhanced strength in microscopic specimens may be related to inhomogeneous stress fields that develop during cure. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 936–945

Infrared Absorption Study of Zn–S Hybrid and ZnS Ultrathin Films Deposited on Porous AAO Ceramic Support

“…After the dissolution of AAO, bundles of ZnS nanotubes were obtained (Figure 2b), which further confirms the homogeneous and complete coverage of the interior of the AAO channels by ZnS material during ALD process. In the EDS spectrum shown in Figure 2c, there are peaks from Zn, S, and C (O and Si elements come from NOA 61 optical adhesive by which the ZnS nanotubes were attached to glass [26]), but no peak from Al was recorded, proving a selective and total dissolution of anodic alumina (in 0.1 M NaOH solution) in the AAO_phosphoric-ZnS-60 nm sample. In Figure 3, the EDS spectra of the AAO_phosphoric-ZnS-60 nm sample before (a) and after annealing (b) are shown (the spectra were acquired until comparable total number of counts).…”

“…10, x FOR PEER REVIEW 5 of 12attached to glass[26]), but no peak from Al was recorded, proving a selective and total dissolution of anodic alumina (in 0.1 M NaOH solution) in the AAO_phosphoric-ZnS-60 nm sample.…”

Toward UV-Triggered Curing of Solvent-Free Polyurethane Adhesives Based on Castor Oil

“…The exploitation of light as an external stimulus for triggering the curing process is especially appealing because it offers the possibility of spatiotemporal control under mild conditions, such as room temperature. Photocurable synthetic adhesives and resins have been employed in biomedicine or dentistry − or more technologically oriented applications. − However, the implementation in formulations of bio-sourced adhesives is rather underexplored. , …”